A. Sewage, waste or any matter having any of the following characteristics or containing any of the following materials shall not be discharged into any part of the sewer system or be allowed to escape into any part of the sewer system:
1. Ashes, cinders, sand, earth, coal, rubbish or any matter which is chemically or physically stable for at least five (5) days at twenty degrees centigrade (20°C) or which would form a deposit or obstruction, or damage or reduce the capacity of the sewer;
2. Inflammable, explosive or poisonous liquids, gases or solids or any matter which after entrance into the sewer system might reasonably be expected to form inflammable, explosive or poisonous liquids, gases or solids;
3. Matter containing suspended solids in excess of one thousand parts per million (1,000 ppm);
4. Matter containing a biochemical oxygen demand in excess of three hundred parts per million (300 ppm);
5. Any petroleum product;
6. Animal or vegetable greases, oils or matter containing animal or vegetable greases or oil of any nature in excess of three hundred parts per million (300 ppm);
7. Matter with a hydrogen ion (pH) concentration below five and five-tenths (5.5) or above nine and zero-tenths (9.0) measured at the point where it enters the sewer system; and
8. Matter that would be poisonous to or inhibit the biologic organisms associated with any sewage treatment process and which in the opinion of the director might interfere with the satisfactory operation of any treatment facility or any portion of the sewer system.
B. Sewage wastes or other matters herein excluded may be discharged into the sewage system only upon written approval of the director and upon the payment to the utilities department of an amount equal to the additional costs for processing the excluded waste as hereinafter provided. (TH Ord. 132A § 2, 1991)